Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2008-04-08
2008-04-08
Payne, David C. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S267000, C375S265000, C375S298000, C714S810000, C714S792000
Reexamination Certificate
active
10765665
ABSTRACT:
Mapping of m input bits to 2mmodulation symbols of a two-dimensional symbol constellation. A quarter-quadrant constellation of 2m-4modulation symbols that are located in a first quadrant of the two-dimensional signal plane is formed with each modulation symbol associated with a respective m-4 bit label. A quarter constellation of the two-dimensional symbol constellation is formed by adding to the quarter-quadrant constellation three copies of the quarter-quadrant constellation rotated by −90 degrees, 180 degrees, and −270 degrees, respectively, and then displacing the quarter constellation by a shift value Δ, with each modulation symbol associated with a respective m-2 bit label. The two-dimensional symbol constellation is then formed by adding to the quarter constellation three copies of the quarter constellation rotated by +90 degrees, 180 degrees, and +270 degrees, respectively. Each symbol of the two dimensional constellation is associated with a respective m bit label of the m input bits.
REFERENCES:
patent: 5150381 (1992-09-01), Forney et al.
Broadcom Corporation
Garlick Bruce E.
Garlick Harrison & Markison LLP
Guarino Rahel
Payne David C.
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